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==Structure of caa3-type cytochrome oxidase==
==Structure of caa3-type cytochrome oxidase==
<StructureSection load='2yev' size='340' side='right' caption='[[2yev]], [[Resolution|resolution]] 2.36&Aring;' scene=''>
<StructureSection load='2yev' size='340' side='right'caption='[[2yev]], [[Resolution|resolution]] 2.36&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[2yev]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2YEV OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2YEV FirstGlance]. <br>
<table><tr><td colspan='2'>[[2yev]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_thermophilus_HB8 Thermus thermophilus HB8]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2YEV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2YEV FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=4AG:(2R)-3-HYDROXYPROPANE-1,2-DIYL+DIHEXADECANOATE'>4AG</scene>, <scene name='pdbligand=5PL:(1R,4S,6R)-6-({[2-(ACETYLAMINO)-2-DEOXY-ALPHA-D-GLUCOPYRANOSYL]OXY}METHYL)-4-HYDROXY-1-{[(15-METHYLHEXADECANOYL)OXY]METHYL}-4-OXIDO-7-OXO-3,5-DIOXA-8-AZA-4-PHOSPHAHEPTACOS-1-YL+15-METHYLHEXADECANOATE'>5PL</scene>, <scene name='pdbligand=7E8:(2R)-2,3-DIHYDROXYPROPYL+(7Z)-TETRADEC-7-ENOATE'>7E8</scene>, <scene name='pdbligand=7E9:1,3-DIHYDROXYPROPAN-2-YL+(Z)-TETRADEC-7-ENOATE'>7E9</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=CUA:DINUCLEAR+COPPER+ION'>CUA</scene>, <scene name='pdbligand=HAS:HEME-AS'>HAS</scene>, <scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.36&#8491;</td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=FME:N-FORMYLMETHIONINE'>FME</scene></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=4AG:(2R)-3-HYDROXYPROPANE-1,2-DIYL+DIHEXADECANOATE'>4AG</scene>, <scene name='pdbligand=5PL:(1R,4S,6R)-6-({[2-(ACETYLAMINO)-2-DEOXY-ALPHA-D-GLUCOPYRANOSYL]OXY}METHYL)-4-HYDROXY-1-{[(15-METHYLHEXADECANOYL)OXY]METHYL}-4-OXIDO-7-OXO-3,5-DIOXA-8-AZA-4-PHOSPHAHEPTACOS-1-YL+15-METHYLHEXADECANOATE'>5PL</scene>, <scene name='pdbligand=7E8:(2R)-2,3-DIHYDROXYPROPYL+(7Z)-TETRADEC-7-ENOATE'>7E8</scene>, <scene name='pdbligand=7E9:1,3-DIHYDROXYPROPAN-2-YL+(Z)-TETRADEC-7-ENOATE'>7E9</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=CUA:DINUCLEAR+COPPER+ION'>CUA</scene>, <scene name='pdbligand=FME:N-FORMYLMETHIONINE'>FME</scene>, <scene name='pdbligand=HAS:HEME-AS'>HAS</scene>, <scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Cytochrome-c_oxidase Cytochrome-c oxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.9.3.1 1.9.3.1] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2yev FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2yev OCA], [https://pdbe.org/2yev PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2yev RCSB], [https://www.ebi.ac.uk/pdbsum/2yev PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2yev ProSAT]</span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2yev FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2yev OCA], [http://pdbe.org/2yev PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2yev RCSB], [http://www.ebi.ac.uk/pdbsum/2yev PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2yev ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/COX13_THET8 COX13_THET8]] Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Subunits 1-3 form the functional core of the enzyme complex. Co I is the catalytic subunit of the enzyme. Electrons originating in cytochrome c are transferred via the copper A center of subunit 2 and heme a of subunit 1 to the bimetallic center formed by heme a3 and copper B. This cytochrome c oxidase shows proton pump activity across the membrane in addition to the electron transfer. [[http://www.uniprot.org/uniprot/Q5SLI2_THET8 Q5SLI2_THET8]] Subunits I and II form the functional core of the enzyme complex. Electrons originating in cytochrome c are transferred via heme a and Cu(A) to the binuclear center formed by heme a3 and Cu(B) (By similarity).
[https://www.uniprot.org/uniprot/COX13_THET8 COX13_THET8] Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Subunits 1-3 form the functional core of the enzyme complex. Co I is the catalytic subunit of the enzyme. Electrons originating in cytochrome c are transferred via the copper A center of subunit 2 and heme a of subunit 1 to the bimetallic center formed by heme a3 and copper B. This cytochrome c oxidase shows proton pump activity across the membrane in addition to the electron transfer.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Cytochrome c oxidase is a member of the haem copper oxidase superfamily (HCO). HCOs function as the terminal enzymes in the respiratory chain of mitochondria and aerobic prokaryotes, coupling molecular oxygen reduction to transmembrane proton pumping. Integral to the enzyme's function is the transfer of electrons from cytochrome c to the oxidase via a transient association of the two proteins. Electron entry and exit are proposed to occur from the same site on cytochrome c. Here we report the crystal structure of the caa3-type cytochrome oxidase from Thermus thermophilus, which has a covalently tethered cytochrome c domain. Crystals were grown in a bicontinuous mesophase using a synthetic short-chain monoacylglycerol as the hosting lipid. From the electron density map, at 2.36 A resolution, a novel integral membrane subunit and a native glycoglycerophospholipid embedded in the complex were identified. Contrary to previous electron transfer mechanisms observed for soluble cytochrome c, the structure reveals the architecture of the electron transfer complex for the fused cupredoxin/cytochrome c domain, which implicates different sites on cytochrome c for electron entry and exit. Support for an alternative to the classical proton gate characteristic of this HCO class is presented.


Structural insights into electron transfer in caa3-type cytochrome oxidase.,Lyons JA, Aragao D, Slattery O, Pisliakov AV, Soulimane T, Caffrey M Nature. 2012 Jul 26;487(7408):514-8. PMID:22763450<ref>PMID:22763450</ref>
==See Also==
 
*[[Cytochrome c oxidase 3D structures|Cytochrome c oxidase 3D structures]]
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2yev" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Cytochrome-c oxidase]]
[[Category: Large Structures]]
[[Category: Thermus thermophilus]]
[[Category: Thermus thermophilus HB8]]
[[Category: Aragao, D]]
[[Category: Aragao D]]
[[Category: Caffrey, M]]
[[Category: Caffrey M]]
[[Category: Lyons, J A]]
[[Category: Lyons JA]]
[[Category: Soulimane, T]]
[[Category: Soulimane T]]
[[Category: Electron transport]]

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